[lttng-dev] status of lttng top

McDermott, Andrew Andrew.McDermott at windriver.com
Mon Oct 22 07:00:03 EDT 2012


> LTTngTop is still work in progress and will remain that way for a long
> time, but the version in the PPA (or in the master branch in git) is
> perfectly usable for offline traces (traces recorded and replayed
> through LTTngTop).
> The "live" branch is more experimental and requires patches in both
> Babeltrace and Lttng-tools (all documented in the README-LIVE file), but
> it worked at the time of Plumbers, I didn't have much time since then to
> rebase the branches.
> I am waiting for the release of Lttng-tools 2.1 (currently in RC) before
> merging those patches. After these patches are integrated, LTTngTop will
> be able to work live without any modifications, so directly reading
> traces in memory shared with the tracer.

Thanks for this info.

Right now my interest is with the live streaming; we have a use case
where the live streaming is really the only practical solution.

Very roughly, would you expect the RC series to conclude this year, or
(early) next year?

> In the meantime we are working on replacing the "home made" state system
> in LTTngTop with a more generic one (which will be used also in LTTV),
> this will cleanup this part of the code and allow to store the state on
> disk. So in a near future we will be able to only read the state instead
> of the trace (once it has been generated), which will compress
> significantly the amount of data we need to keep in order to access the
> kind of statistics provided by LTTngTop.
> If you want to try LTTngTop, you can just install the package and follow
> the man page to record a trace with the right contexts, it should work
> as is.
> If you have any questions and/or feedback, please don't hesitate to ask.
> Thanks,
> Julien
> On 08/10/12 05:57 PM, McDermott, Andrew wrote:
>> I was wondering what the status of lttng top was.  I'm happy to add the
>> daily Ubuntu PPA and try it that way, or equally building from source.
>>  But, before I tread that route, are there any gotchas to be aware of.
>> Is it still considered work-in-progress, etc.
>> Thanks.
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